Stressed Oxidation Of C Sic Composites

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Stressed Oxidation of C/SiC Composites

Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Stressed Oxidation of C/SiC Composites by :

Download or read book Stressed Oxidation of C/SiC Composites written by and published by . This book was released on 1997 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constant load, stressed oxidation testing was performed on T-300 C/SiC composites with a SiC seal coat. Test conditions included temperatures ranging from 350 to 1500 deg C at stresses of 69 MPa and 172 MPa (10 and 25 ksi). The coupon subjected to stressed oxidation at 550 deg C/69 MPa for 25 hours had a room temperature residual strength one-half that of the as-received coupons. The coupon tested at the higher stress and all coupons tested at higher temperatures failed in less than 25 hr. Microstructural analysis of the fracture surfaces, using SEM (scanning electron microscopy), revealed the formation of reduced cross-sectional fibers with pointed tips. Analysis of composite cross-sections show pathways for oxygen ingress. The discussion will focus on fiber/matrix interphase oxidation and debonding as well as the formation and implications of the fiber tip morphology.

Oxidation of Continuous Carbon Fibers Within a Silicon Carbide Matrix Under Stressed and Unstressed Conditions

Author : Michael C. Halbig
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Oxidation of Continuous Carbon Fibers Within a Silicon Carbide Matrix Under Stressed and Unstressed Conditions by : Michael C. Halbig

Download or read book Oxidation of Continuous Carbon Fibers Within a Silicon Carbide Matrix Under Stressed and Unstressed Conditions written by Michael C. Halbig and published by . This book was released on 2000 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon fiber reinforced silicon carbide matrix composites (C/SiC) are a ceramic matrix composite (CMC) material that offers benefits for use in a wide range of high temperature structural applications. However the susceptibility of the carbon fibers to degradation in oxidizing environments has hindered the material's use in certain applications requiring long lives under oxidizing conditions. The susceptibility of carbon fibers to oxidation will be discussed as well as the enhancement (improvement in oxidation resistance) of C/SiC materials. Thermogravimetric analysis of carbon fibers shows susceptibility to oxidation in two distinct kinetic regimes. However, in the thermogravimetric (wt. loss) analysis of unstressed, unenhanced, seal coated C/SiC coupons, the two regimes were not observed due to crack closure and matrix effects, which inhibited the oxidation process. Stressed oxidation (creep rupture) tests put the material under a stress, which is a more realistic condition for many applications. In stressed oxidation tests, the two oxidation kinetics regimes were observed. These tests can provide better insight into how the material will perform in applications involving stress. Stressed oxidation of enhanced materials containing oxidation inhibitors showed significantly improved lives at the specific test conditions considered, although there was susceptibility to oxidation at intermediate temperatures.

Stressed Oxidation of C/SiC Composites

Author : Michael C. Halbig
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Stressed Oxidation of C/SiC Composites by : Michael C. Halbig

Download or read book Stressed Oxidation of C/SiC Composites written by Michael C. Halbig and published by . This book was released on 1997 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constant load, stressed oxidation testing was performed on T-300 C/SiC composites with a SiC seal coat. Test conditions included temperatures ranging from 350 to 1500 deg C at stresses of 69 MPa and 172 MPa (10 and 25 ksi). The coupon subjected to stressed oxidation at 550 deg C/69 MPa for 25 hours had a room temperature residual strength one-half that of the as-received coupons. The coupon tested at the higher stress and all coupons tested at higher temperatures failed in less than 25 hr. Microstructural analysis of the fracture surfaces, using SEM (scanning electron microscopy), revealed the formation of reduced cross-sectional fibers with pointed tips. Analysis of composite cross-sections show pathways for oxygen ingress. The discussion will focus on fiber/matrix interphase oxidation and debonding as well as the formation and implications of the fiber tip morphology.

Degradation of Continuous Fiber Ceramic Matrix Composites Under Constant-Load Conditions

Author :
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Degradation of Continuous Fiber Ceramic Matrix Composites Under Constant-Load Conditions by :

Download or read book Degradation of Continuous Fiber Ceramic Matrix Composites Under Constant-Load Conditions written by and published by . This book was released on 2000 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ten different ceramic matrix composite (CMC) materials were subjected to a constant load and temperature in an air environment. Tests conducted under these conditions are often referred to as stressed oxidation or creep rupture tests. The stressed oxidation tests were conducted at a temperature of 1454 deg C at stresses of 69 MPa, 172 MPa and 50% of each material's ultimate tensile strength. The ten materials included such CMCs as C/SiC, SiC/C, SiC/SiC, SiC/SiNC and C/C. The time to failure results of the stressed oxidation tests will be presented. Much of the discussion regarding material degradation under stressed oxidation conditions will focus on C/SiC composites. Thermogravimetric analysis of the oxidation of fully exposed carbon fiber (T300) and of C/SiC coupons will be presented as well as a model that predicts the oxidation patterns and kinetics of carbon fiber tows oxidizing in a nonreactive matrix.

Factors Controlling Elevated Temperature Strength Degradation of Silicon Carbide Composites

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721788200
Total Pages : 26 pages
Book Rating : 4.7/5 (882 download)

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Book Synopsis Factors Controlling Elevated Temperature Strength Degradation of Silicon Carbide Composites by : National Aeronautics and Space Administration (NASA)

Download or read book Factors Controlling Elevated Temperature Strength Degradation of Silicon Carbide Composites written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: For 5 years, the cooperative agreement NCC3-763 has focused on the development and understanding of Sic-based composites. Most of the work was performed in the area of SiC fiber-reinforced composites for UEET and NGLT and in collaboration with Goodrich Corporation under a partially reimbursable Space Act Agreement. A smaller amount of work was performed on C fiber-reinforced SiC matrix composites for NGLT. Major accomplishments during this agreement included: Improvements to the interphase used in melt-infiltrated (MI) SiC/SiC composites which increases the life under stressed-oxidation at intermediate temperatures referred to as "outside-debonding". This concept is currently in the patent process and received a Space Act Award. Mechanistic-based models of intermediate temperature degradation for MI SiC/SiC Quantification and relatively robust relationships for matrix crack evolution under stress in SiC/SiC composites which serve as the basis for stress-strain and elevated temperature life models The furthering of acoustic emission as a useful tool in composite damage evolution and the extension of the technique to other composite systems Development of hybrid C-SiC fiber-reinforced SiC matrix composites Numerous presentations at conferences, industry partners, and government centers and publications in recognized proceedings and journals. Other recognition of the author's accomplishments by NASA with a TGIR award (2004), NASA's Medal for Public Service (2004), and The American Ceramic Society s Richard M. Fulrath Award (2005). The following will briefly describe the work of the past five years in the three areas of interest: SiC/SiC composite development, mechanistic understanding and modeling of SiC/SiC composites, and environmental durability of C/SiC composites. More detail can be found in the publications cited at the end of this report. Glenn Research Center

Degradation of Continuous Fiber Ceramic Matrix Composites Under Constant Load Conditions

Author : MC. Halbig
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Degradation of Continuous Fiber Ceramic Matrix Composites Under Constant Load Conditions by : MC. Halbig

Download or read book Degradation of Continuous Fiber Ceramic Matrix Composites Under Constant Load Conditions written by MC. Halbig and published by . This book was released on 2000 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ten different ceramic matrix composite (CMC) materials were subjected to a constant load and temperature in an air environment. Tests conducted under these conditions are often referred to as stressed oxidation or creep rupture tests. The stressed oxidation tests were conducted at a temperature of 1454°C at stresses of 69 MPa, 172 MPa and 50% of each material's ultimate tensile strength. The ten materials included such CMCs as C/SiC, SiC/C, SiC/SiC, SiC/SiNC and C/C. The time to failure results of the stressed oxidation tests will be presented. Much of the discussion regarding material degradation under stressed oxidation conditions will focus on C/SiC composites. Thermogravimetric analysis of the oxidation of fully exposed carbon fiber (T300) and of C/SiC coupons will be presented as well as a model that predicts the oxidation patterns and kinetics of carbon fiber tows oxidizing in a nonreactive matrix.

Durability of Ceramic-Matrix Composites

Author : Li Longbiao
Publisher : Woodhead Publishing
ISBN 13 : 0081030223
Total Pages : 478 pages
Book Rating : 4.0/5 (81 download)

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Book Synopsis Durability of Ceramic-Matrix Composites by : Li Longbiao

Download or read book Durability of Ceramic-Matrix Composites written by Li Longbiao and published by Woodhead Publishing. This book was released on 2020-02-07 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Durability of Ceramic-Matrix Composites presents the latest information on these high-temperature structural materials and their outstanding advantages over more conventional materials, including their high specific strength, high specific modulus, high temperature resistance and good thermal stability. The critical nature of the application of these advanced materials makes it necessary to have a complete understanding of their characterization. This book focuses explicitly on the durability of CMCs and will be extremely valuable for materials scientists and engineers who are dealing with the simulation of durability response and fatigue of ceramic matrix composites. Provides the latest theoretical and applied research in the field of ceramic matrix composites, particularly as it relates to usage in aerospace propulsion systems Presents extensive information on the micromechanics of damage evolution, lifetime prediction and durability in ceramic matrix composites Details parameter studies that are valuable for materials development and lifetime durability studies

Oxygen Diffusion and Reaction Kinetics in Continuous Fiber Ceramic Matrix Composites

Author : Michael C. Halbig
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Oxygen Diffusion and Reaction Kinetics in Continuous Fiber Ceramic Matrix Composites by : Michael C. Halbig

Download or read book Oxygen Diffusion and Reaction Kinetics in Continuous Fiber Ceramic Matrix Composites written by Michael C. Halbig and published by . This book was released on 1999 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous stressed oxidation tests of C/SiC composites at elevated temperatures (350 deg C to 1500 deg C) and sustained stresses (69 MPa and 172 MPa) have led to the development of a finite difference cracked matrix model. The times to failure in the samples suggest oxidation occurred in two kinetic regimes defined by the rate controlling mechanisms (i.e.; diffusion controlled and reaction controlled kinetics). Microstructural analysis revealed preferential oxidation along as-fabricated, matrix microcracks and also suggested two regimes of oxidation kinetics dependent on the oxidation temperature. Based on experimental results, observation, and theory, a finite difference model was developed. The model simulates the diffusion of oxygen into a matrix crack bridged by carbon fibers. The model facilitates the study of the relative importance of temperature, the reaction rate constant, and the diffusion coefficient on the overall oxidation kinetics.

The Time-Dependent Deformation of Carbon Fiber-Reinforced Melt-Infiltrated Silicon Carbide Ceramic Matrix Composites

Author : M. Singh
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis The Time-Dependent Deformation of Carbon Fiber-Reinforced Melt-Infiltrated Silicon Carbide Ceramic Matrix Composites by : M. Singh

Download or read book The Time-Dependent Deformation of Carbon Fiber-Reinforced Melt-Infiltrated Silicon Carbide Ceramic Matrix Composites written by M. Singh and published by . This book was released on 2000 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stress-rupture and stress-relaxation behavior of carbon fiber-reinforced melt-infiltrated silicon carbide composites was investigated in ambient air at 1000°C. It was found that the compliance of the material increases continuously with time when subjected either to a constant composite stress or strain in air at 1000°C. The changes in compliance are explained based on the oxidation of the fiber coating, and on the oxidation, loss of cross-sectional area and rupture of the reinforcing fibers. In the case of stress-rupture, the load previously carried by failed fibers is redistributed to their surviving neighboring fibers inducing further fiber failure. During stress-relaxation, fiber failure is reflected directly on the reduction of the load carried by the composite.

High Temperature Mechanical Behavior of Ceramic-Matrix Composites

Author : Longbiao Li
Publisher : John Wiley & Sons
ISBN 13 : 3527831789
Total Pages : 386 pages
Book Rating : 4.5/5 (278 download)

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Book Synopsis High Temperature Mechanical Behavior of Ceramic-Matrix Composites by : Longbiao Li

Download or read book High Temperature Mechanical Behavior of Ceramic-Matrix Composites written by Longbiao Li and published by John Wiley & Sons. This book was released on 2021-06-08 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Temperature Mechanical Behavior of Ceramic-Matrix Composites Covers the latest research on the high-temperature mechanical behavior of ceramic-matrix composites Due to their high temperature resistance, strength and rigidity, relatively light weight, and corrosion resistance, ceramic-matrix composites (CMCs) are widely used across the aerospace and energy industries. As these advanced composites of ceramics and various fibers become increasingly important in the development of new materials, understanding the high-temperature mechanical behavior and failure mechanisms of CMCs is essential to ensure the reliability and safety of practical applications. High Temperature Mechanical Behavior of Ceramic-Matrix Composites examines the behavior of CMCs at elevated temperature—outlining the latest developments in the field and presenting the results of recent research on different CMC characteristics, material properties, damage states, and temperatures. This up-to-date resource investigates the high-temperature behavior of CMCs in relation to first matrix cracking, matrix multiple cracking, tensile damage and fracture, fatigue hysteresis loops, stress-rupture, vibration damping, and more. This authoritative volume: Details the relationships between various high-temperature conditions and experiment results Features an introduction to the tensile, vibration, fatigue, and stress-rupture behavior of CMCs at elevated temperatures Investigates temperature- and time-dependent cracking stress, deformation, damage, and fracture of fiber-reinforced CMCs Includes full references and internet links to source material Written by a leading international researcher in the field, High Temperature Mechanical Behavior of Ceramic-Matrix Composites is an invaluable resource for materials scientists, surface chemists, organic chemists, aerospace engineers, and other professionals working with CMCs.

Hysteresis of Composites

Author : Li Longbiao
Publisher : BoD – Books on Demand
ISBN 13 : 1789846196
Total Pages : 178 pages
Book Rating : 4.7/5 (898 download)

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Book Synopsis Hysteresis of Composites by : Li Longbiao

Download or read book Hysteresis of Composites written by Li Longbiao and published by BoD – Books on Demand. This book was released on 2019-12-11 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the hysteresis and damping of, and damage to, composites. It analyzes the following areas: damage mechanisms affecting the hysteresis of composites, mechanical hysteresis of ceramic-matrix composites, hysteresis behavior of fiber-reinforced ceramic-matrix composites (CMCs), relationship between the internal damage and hysteresis loops of CMCs, and mechanical hysteresis loops and the fiber/matrix interface frictional coefficient of SiC/CAS and C/SiC composites. A damping study on aluminum-multiwalled carbon nanotube-based nanocomposite materials is discussed to increase the damping property for applications like engine heads, pistons, cylinder blocks, and other aerospace components. The effect of ceramic/graphite addition to the dry sliding wear behavior of copper-based hybrid composites has been assessed at three different normal loads of 9.81, 19.62, and 29.34 N. The authors hope this book will help material scientists and engineering designers to understand and master the hysteresis of composites.

Advances in Ceramic Matrix Composites X

Author : J. P. Singh
Publisher : John Wiley & Sons
ISBN 13 : 1118408365
Total Pages : 182 pages
Book Rating : 4.1/5 (184 download)

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Book Synopsis Advances in Ceramic Matrix Composites X by : J. P. Singh

Download or read book Advances in Ceramic Matrix Composites X written by J. P. Singh and published by John Wiley & Sons. This book was released on 2012-04-11 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ceramic matrix composites are likely candidates for high-temperature structural applications in industries such as aerospace, utilities, and transportation. This volume includes papers on advances in basic science and technology of ceramic matrix composites and how these advances can be used to address technological issues faced by industry.

Micromechanics of Ceramic-Matrix Composites at Elevated Temperatures

Author : Longbiao Li
Publisher : Springer Nature
ISBN 13 : 9819712947
Total Pages : 139 pages
Book Rating : 4.8/5 (197 download)

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Book Synopsis Micromechanics of Ceramic-Matrix Composites at Elevated Temperatures by : Longbiao Li

Download or read book Micromechanics of Ceramic-Matrix Composites at Elevated Temperatures written by Longbiao Li and published by Springer Nature. This book was released on with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A, Volume 23, Issue 3

Author : Hua-Tay Lin
Publisher : John Wiley & Sons
ISBN 13 : 0470295198
Total Pages : 872 pages
Book Rating : 4.4/5 (72 download)

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Book Synopsis 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A, Volume 23, Issue 3 by : Hua-Tay Lin

Download or read book 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A, Volume 23, Issue 3 written by Hua-Tay Lin and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.

Issues in Materials and Manufacturing Research: 2011 Edition

Author :
Publisher : ScholarlyEditions
ISBN 13 : 1464963304
Total Pages : 11119 pages
Book Rating : 4.4/5 (649 download)

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Book Synopsis Issues in Materials and Manufacturing Research: 2011 Edition by :

Download or read book Issues in Materials and Manufacturing Research: 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 11119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Materials and Manufacturing Research: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Materials and Manufacturing Research. The editors have built Issues in Materials and Manufacturing Research: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Materials and Manufacturing Research in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Materials and Manufacturing Research: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Ceramic Fibers and Coatings

Author : Committee on Advanced Fibers for High-Temperature Ceramic Composites
Publisher : National Academies Press
ISBN 13 : 0309569036
Total Pages : 112 pages
Book Rating : 4.3/5 (95 download)

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Book Synopsis Ceramic Fibers and Coatings by : Committee on Advanced Fibers for High-Temperature Ceramic Composites

Download or read book Ceramic Fibers and Coatings written by Committee on Advanced Fibers for High-Temperature Ceramic Composites and published by National Academies Press. This book was released on 1998-05-05 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-temperature ceramic fibers are the key components of ceramic matrix composites (CMCs). Ceramic fiber properties (strength, temperature and creep resistance, for example)-along with the debonding characteristics of their coatings-determine the properties of CMCs. This report outlines the state of the art in high-temperature ceramic fibers and coatings, assesses fibers and coatings in terms of future needs, and recommends promising avenues of research. CMCs are also discussed in this report to provide a context for discussing high-temperature ceramic fibers and coatings.

Ceramic Matrix Composites

Author : Longbiao Li
Publisher : Elsevier
ISBN 13 : 0323997074
Total Pages : 216 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Ceramic Matrix Composites by : Longbiao Li

Download or read book Ceramic Matrix Composites written by Longbiao Li and published by Elsevier. This book was released on 2023-06-30 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ceramic Matrix Composites: Lifetime and Strength Prediction Under Static and Stochastic Loading focuses on the strain response and lifetime prediction of fiber-reinforced ceramic-matrix composites under stress-rupture loading at intermediate temperatures. Typical damage mechanisms of matrix cracking, interface debonding and oxidation, and fiber’s oxidation and fracture are considered in the micromechanical analysis. Effects of composite’s constituent properties, peak stress, and testing temperature on the composite’s strain response and lifetime are also analyzed in detail. Finally, a comparison of constant and different stochastic stress spectrum on composite’s damage evolution and fracture is discussed. This book will be a practical guide for the material researcher and component designer needing to better understand the composite’s damage and fracture behavior under stress-rupture loading at intermediate temperatures. Contains detailed analysis of the stress-rupture behavior of fiber-reinforced ceramic-matrix composites Includes experimental data on stress-rupture behavior of different CMCs Presents micromechanical constituent models for characterizing damage and fracture behavior under stress-rupture loading Provides data on the physical properties of each constituent at various temperatures, along with the composite’s response